[w3c/browser-payment-api] Adding dialog close event (#387)

We noticed that there is not a way to respond to the Payment Mediator UI being torn down. We have the .show() callback when the PaymentRequest is resolved, but the spec currently says this occurs as soon as the PaymentResponse is received. 

I propose that we add an event for when the dialog closes, an "ondialogclose" event. Thoughts?

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